SN74LS151NS Equivalent & Substitute Parts

Part Overview

The SN74LS151NS is a Logic Multiplexer IC manufactured by Texas Instruments, configured as a 1 x 8:1 multiplexer in a 16-pin DIP package. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Finding equivalent substitute parts is necessary due to the product's end-of-life status and the finite stock of 3200 pieces. The SN74LS151NSR provides a direct functional equivalent with identical electrical specifications and differs primarily in packaging format.

Substiute Parts

SN74LS151NS

Texas InstrumentsIn Stock: 3270SN74LS151NS Datasheet

Current PartRFQ

SN74LS151NSR

Texas InstrumentsIn Stock: 1914SN74LS151NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN74LS151NSR qualifies as a direct substitute based on the following critical parameters:

• Identical manufacturer (Texas Instruments)
• Identical base product number (74LS)
• Identical circuit configuration (1 x 8:1 multiplexer)
• Identical electrical specifications (voltage supply, output current ratings, operating temperature)
• Identical functional performance and pin configuration
• Equivalent compliance certifications (ROHS3, REACH Unaffected)
• Equivalent moisture sensitivity level (MSL 1)

The primary distinction is packaging format: the main part uses through-hole DIP packaging, while the substitute uses surface-mount Tape & Reel format. This difference affects assembly method and board layout but does not alter electrical compatibility or functional performance.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS151NSR is a valid substitute for the SN74LS151NS based on electrical and functional equivalence. The SN74LS151NSR holds Active product status, ensuring continued availability and support from Texas Instruments, whereas the main part is Last Time Buy with finite inventory. Both components maintain identical compliance certifications (ROHS3 Compliant, REACH Unaffected) and moisture sensitivity ratings.

Selection between these parts depends on assembly requirements: the SN74LS151NS accommodates through-hole assembly and breadboard prototyping, while the SN74LS151NSR requires surface-mount assembly capabilities. For new designs or production runs, the SN74LS151NSR is recommended due to its Active status and continued manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS151NSR directly replace the SN74LS151NS in existing designs?

A: Electrical and functional replacement is direct. Physical replacement requires board redesign to accommodate the different package format: the SN74LS151NS uses 16-pin DIP through-hole mounting, while the SN74LS151NSR uses 16-SOIC surface-mount packaging.

Q: What is the significance of the Last Time Buy status for the SN74LS151NS?

A: Last Time Buy indicates the manufacturer has discontinued production. The available inventory of 3200 pieces represents the final stock. Once depleted, the part will no longer be available from Texas Instruments.

Q: Are there compliance differences between these parts?

A: No. Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical Moisture Sensitivity Level 1 ratings.

Q: What are the output current specifications?

A: Both parts specify 400µA output high current and 8mA output low current, ensuring identical drive capability for downstream logic circuits.

Q: Does the supply voltage range differ between these parts?

A: No. Both parts operate within the identical 4.75V to 5.25V supply voltage range and support the same 0°C to 70°C operating temperature range.

Q: What packaging considerations apply to the SN74LS151NSR?

A: The SN74LS151NSR is supplied in Tape & Reel format for automated surface-mount assembly. The 16-SOIC package measures 0.209 inches (5.30mm) in width, requiring compatible PCB footprints and reflow soldering processes.